Grate



"3 Sheets-Sheet 1.

No Model.) L. R. ANDREWS.

GMT-B;

No.* 526,957; Patented Oct. 2, 1894.-

INVENTOP ATTORNEYS.

THE uonms PETERS 0a., FNOTO-LITHOU WASHINGTON, u a

(No Model.) v 3 Sheets- Sheet 2.

L. R. ANDREWS.

GRATE.

Patented Oct. 2, 1894.

INVENTOR ATTORNEYS.

THE NORRIS P511915 60., PHuTu-uma. WASHINGTON. a. Q

v(No Model.)

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INVENTOH ATTORNEYS.

.TNE nomus PETERS my. vuo'rau'mou wasumomu. n. c.

PATE T OFFICE.

LEE R1 ANDREWS, OF BATH BEACH, NEW YORK.

GRAT E.

SPECIFICATION forming part of Letters Patent No. 526,957, dated October;2, 1894.

. Application filed October 18,1893.

To all whom; it may concern Be it known that I, LEE ROBERTS ANDREWS, ofBath Beach, in the county of Kings and State of New York, have inventeda new and Improved Grate, of which the following is a full, clear, andexact description.

The object of the invention is to provide a new andimproved grate whichis simple and durable in construction, very effective in operation, moreespecially designed for use in locomotive and other boilers, furnaces,&c., and arranged to give the operator complete control of the burningfuel and to permit of conveniently raking it and removing clinkers.

The invention consists of certain parts and details, and combinations ofthe same, as will be hereinafter described and then pointed out in theclaims. a

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is aplan view of the improvement with parts in section, andarranged in a locomotive fire-box. Fig. 2 is a sectional side elevationof the same on the line 2-2 of Fig. 1. Fig. 3 is a detail plan view ofpart of one of the cylindrical grate bars. Fig. 4 is an 'end elevationof the improvement. Fig. 5 is a transverse section of the same on theline 5-5 of Fig. 1. Fig. 6 is a sectional side elevation of part of theimprovement on the line 6-6 of Fig. 1; and Fig. 7 is a sectional sideelevation of another form of the improve- -H. The intermittenhmotionthus given to ment.

The improved grate as illustrated in the fire-box A, and the said grateis composed of a series of transversely-extending cylindrical grate barsB arranged one alongside the other and formed on their peripheralsurface with projections arranged ;in parallel spiral rows with theirbases contiguous to each other as plainly indicated in Fig. 3, so as togive a symmetrically roughened surface to each of the grate bars.

As shown in Fig. 2, each of the grate bars is made hollow preferably bybeing formed with transverse or longitudinal apertures to make the sameperfectly light and to permit the circulation of air to keep the gratebars as cool as possible. Each of the cylindrical Serial No. 488,446.(No model.)

grate bars B has its shaft B journaled in side strips A and A securedtothe sides of thefire-box A, as plainly illustrated in Figs. 1, 5 and6. On each of the grate bars B and near one end thereof is secured orformed a gear wheel C, and the several gear wheels are pref:

:bars, I mesh the gear wheels of the-end grate bars B with spur wheelsDjournaled in suitable bearings attached to the side strip A.

Each spur wheel D is formed at its face with a 1 bevel gear wheel E inmesh with a like gear wheel F secured on a longitudinally-extendingshaft G journaled in suitable bearings at the end of the fire-box A. Onthe rear end of the shaft outside of the fire-box A is secured a ratchetwheelH engaged by aspring pressed pawl l fulcrumed on an arm J mountedto swing loosely on the shaft G and connected with a rod K extending tothe deck L of the locomotive'so as to be under the control of theoperator to permit the latter to impart by the said rod, an up and downswinging motion. to the arm J to cause a revolving 0f the shaft G in onedirection by the action of the spring pressed pawl I on the ratchetwheel the shaft G is transmitted by the bevel gear drawings, is shown asapplied to a locomotive P wheels F to the bevel gear wheels E so thatthe the latter is transmitted to the gear wheel 0 of the end cylindricalgrate bars B, whereby all the grate bars are rotated in unison, as

above described.

Now, when the fuel is burning on top of the grate bars, andlthe operatorimparts a rotary motion to the same, as above described, then the fuelis disturbed and broken up at the under side by the action of theroughened surfaces of the said grate bars, to cause the ashes to readilypass downward between adjacent grate bars to the ash pan. It will alsobe seen that should any clinkers lodge between two adjacent grate bars,the rotary motion of the latter and their roughened surfaces will breakup the clinkers so that they finally drop down into the ash pan.

It is understood that the grate bars are suf ficiently far apart topermit sufficient admis sion of air for complete combustion, the airbeing free to circulate over the recesses formed by the roughenedsurfaces of the grate bars to be thus distributed under the entire underside of the burning fuel.

In order to protect the several gear wheels C from the heat generated inthe fire-box A by the burningfuel on top of the grate bars, I provide aperforated hood N formed with dovetail posts N adapted to engage thevertical parts of L-shaped notches A forming the bearings for that endof the shafts B located on the strip A. See Fig. 6. By this arrangement,the hood N is securely held in place on the strip A, and can be removedtherefrom by lifting the hood upward, and at the same time the posts Nlook some of the ends of the shafts B in place to permit their rotation,so as to prevent longitudinal movement thereof. When thehoodN isremoved,the L-shaped recesses A permit of conveniently removing any one of thegrate bars B for repairs or for other purposes. In order to do this, thenext adjacent grate bar is pushed forward to permit of sliding the shaft3 from the horizontal part of the notch A into the vertical part, topermit of lifting this grate bar upward to release the shaft D" from thenotch A, and by pulling it transversely to release the other end of theshaft from its bearing in the strip A As illustrated in Fig. 7 the gratebars B do not extend to the ends of thefire-box A, so as to leavesufficient room for dumping grates O and O, which, when swung downwardpermit the operator to dump part of the fuel, clinkers, ashes, &c.,either at the front or rear end of the fire-box. Each dumping grate O orO is pivoted at O to either the strips A, A or sides of [the fire-box,and is provided with a downwardly-extending arm 0 connected by alongitudinally-extending link P or P with a lever Q or Q fulcrumedpreferably on the deck L and under the control of the operator, so as toswing the respective dumping grate O or 0 from its normal horizontalposition into a downward angular position as illustrated at the right inFig. 7, to dump the fuel at that end of the fire-box. It will also beseen by reference to Fig. 7, that the several gear wheels 0 on the gratebars B are not in mesh with each other but are in mesh with intermediategear wheels 0 so that if one grate bar is rotated, the several gratebars are rotated simultaneously, and all in the same direction, insteadof in opposite directions, as previously described, in reference to thegrate bars shown in Fig. 1.

The gear wheels 0 at the end grate bars B mesh in spur wheels Dconnected with the shaft G as previously explained, so that anintermittent rotary motion can be given to the gear wheels 0 to rotateall the grate .bars 13 in unison and in one direction, either forward orbackward according to the direction in which the shaft G turns. By thisarrangement large clinkers which locate between two adjacent-grate barsand cannot be crushed, can readily be removed to either the front orrear end of the fire-box ontoa corresponding dumpi ng grate, from whichthe clinkers or other material can then be dumped into the ash pan.

It will be understood that the dumping grates O 0' may be employed inconnection with the construction represented in Figs. 1 to 6, and ifdesired, only one dumping grate will be provided.

The grates may be operated by a small cylinder attached to the boiler,using steam or compressed airfor power as desired, the piston rod of thesaid cylinder being connect-ed, in this case, with the rod K asindicated in dotted lines in Fig. i.

Having thus fully described my invention, I claimas new and desire tosecure by Letters Patent- 1. A grate comprising aseries of revolublegrate bars and gear wheels connecting the same with each other, stripsprovided with open slots in which the grate bars are journaled, and aremovable hood having posts engaging the said slots of the strips tohold the shafts of the grate bars in place, said hood covering the gearWheels, substantially as described.

2. A grate comprising a series of revoluble cylindrical grate bars,strips forming bearin gs for the shafts of the said grate bars, gearwheels for connecting the said grate bars with each other, aperforatedhood held removably on one of the said strips to cover the said gearwheels, the said hood being provided with dovetail posts engagingcorrespondingly shaped dovetail grooves in the bearings for the shafts,to lock the latter in place on the corresponding strips, substantiallyas shown and described.

LEE R. ANDREWS.

lVitnesses:

THEO. G. HOSTER, ,J. L. MCAULIFF.

